# MUST PV1800 register map (extracted from protocol v1.4.15)

Source: `PH1800-PV1800-EP1800-PV3500-EP3500-RS485-Modbus-RTU-Protocol-1.4.15.xlsx`
(in this same directory). Extracted with openpyxl.

The XLSX is authoritative; this Markdown rendering exists so you
can grep / diff / read it without Excel.

---

## Sheet: `Sheet1`

| Address | Type | Name | Unit / Values |
|---------|------|------|---------------|

## Sheet: `Sheet2`

| Address | Type | Name | Unit / Values |
|---------|------|------|---------------|

## Sheet: `Inverter modbusRTU (ID == 4)`

| Address | Type | Name | Unit / Values |
|---------|------|------|---------------|
| 20000 | RO | The type of machine High |  PH/EP/PV |
| 20001 | RO | The type of machine Low | 1800/3000 |
| 20002 | RW | Serial number High |  |
| 20003 | RW | Serial number Low |  |
| 20004 | RO | Hardware version | 1.00.00 |
| 20005 | RO | Software version | 1.00.00  |
| 20006 | RO | Communication Protocal Edition | 1.00.00 |
| 20009 | RW | Battery voltage calibration coefficient | 16384 |
| 20010 | RW | Inverter voltage calibration coefficient | 16384 |
| 20011 | RW | Grid voltage calibration coefficient | 16384  |
| 20012 | RW | Bus voltage calibration coefficient | 16384 |
| 20013 | RW | Control Current calibration coefficient | 16384 |
| 20014 | RW | Inverter Current calibration coefficient | 16384 |
| 20015 | RW | Grid Current calibration coefficient | 16384 |
| 20016 | RW | Load Current calibration coefficient | 16384 |
| 20101 | RW | Inverter offgrid work enable | 0：OFF 1：ON   |
| 20102 | RW | Inverter output voltage Set | 220.0V-240.0V |
| 20103 | RW | Inverter output frequency Set | 50.00Hz/60.00Hz |
| 20104 | RW | Inverter search mode enable | 0：OFF 1：ON   |
| 20108 | RW | Inverter discharger to grid enable | 48V:   0：OFF  1：ON    24V:  Null |
| 20109 | RW | Energy use mode | 48V:1:SBU;2:SUB;3:UTI;4:SOL (for PV;PH)         1:BAU; 3:UTI;4:BOU (for EP)  12V 24V:1:SBU;;3:UTI;4:SOL (for PV;PH)         1:BU; 3:UTI (for EP)   |
| 20111 | RW | Grid protect standard | 0：VDE4105; 1：UPS  ;  2：home ;3:GEN |
| 20112 | RW | SolarUse Aim | 0:LBU  1:BLU(defalut)(for PV;PH) 0:LB  1:LU(defalut)  (for EP) |
| 20113 | RW | Inverter max discharger current | 48V:  0.1A（AC） 12V 24V:  Null |
| 20118 | RW | Battery stop discharging voltage | 0.1V   |
| 20119 | RW | Battery stop charging voltage | 0.1V   |
| 20125 | RW | Grid max charger current set | 0.1A(DC) |
| 20127 | RW | Battery low voltage | 0.1V |
| 20128 | RW | Battery high voltage | 0.1V |
| 20132 | RW | Max Combine charger current | 0.1A(DC)(for PV;PH) |
| 20142 | RW | System setting |  |
| 20143 | RW | Charger source priority | 0:Soalr first  (for PV;PH) 2:Solar and Utility(default)  (for PV;PH) 3:Only Solar  (for PV;PH)   2:Utility charger enable (default)  (for EP) 3:Utility charger disable   (for EP)  |
| 20144 | RW | Solar power balance | 0:SBD 1:SBE |
| 20213 | RW | Remove the accumulated data | 0：No remove the accumulated data                                             1：Remove the accumulated data    |
| 20214 | RW | Reset the parameter | 0：No effect                                                           1：Action  |
| 25201 | RO | work state | 0:PowerOn 1:SelfTest 2:OffGrid 3:Grid-Tie 4:ByPass 5:Stop 6:Grid charging |
| 25202 | RO | AC voltage grade | 230:230V 120:120V |
| 25203 | RO | Rated power(VA) | VA |
| 25204 | RO | reserved |  |
| 25205 | RO | Battery voltage | 0.1V |
| 25206 | RO | Inverter voltage | 0.1V |
| 25207 | RO | Grid voltage | 0.1V |
| 25208 | RO | BUS voltage | 0.1V |
| 25209 | RO | Control current | 0.1A |
| 25210 | RO | Inverter current | 0.1A |
| 25211 | RO | Grid current | 0.1A |
| 25212 | RO | Load current | 0.1A |
| 25213 | RO | PInverter | 1W |
| 25214 | RO | PGrid | 1W |
| 25215 | RO | PLoad | 1W |
| 25216 | RO | Load percent | 0.01 |
| 25217 | RO | SInverter | 1VA |
| 25218 | RO | SGrid | 1VA |
| 25219 | RO | Sload | 1VA |
| 25220 | RO | reserved |  |
| 25221 | RO | Qinverter | 1var |
| 25222 | RO | Qgrid | 1var |
| 25223 | RO | Qload | 1var |
| 25224 | RO | reserved |  |
| 25225 | RO | Inverter frequency | 0.01Hz |
| 25226 | RO | Grid frequency | 0.01Hz |
| 25227 | RO | reserved |  |
| 25228 | RO | reserved |  |
| 25229 | RO | Inverter max number |  |
| 25230 | RO | Combine type |  |
| 25231 | RO | Inverter number |  |
| 25232 | RO | reserved |  |
| 25233 | RO | AC radiator temperature | 1℃ |
| 25234 | RO | Transformer temperature | 1℃ |
| 25235 | RO | DC radiator temperature | 1℃ |
| 25236 | RO | reserved |  |
| 25237 | RO | Inverter relay state | 0: Disconnect 1:Connect |
| 25238 | RO | Grid relay state | 0: Disconnect 1:Connect |
| 25239 | RO | Load relay state | 0: Disconnect 1:Connect |
| 25240 | RO | N_Line relay state | 0: Disconnect 1:Connect |
| 25241 | RO | DC relay state | 0: Disconnect 1:Connect |
| 25242 | RO | Earth relay state | 0: Disconnect 1:Connect |
| 25243 | RO | reserved |  |
| 25244 | RO | reserved |  |
| 25245 | RO | Accumulated charger power high | 1000KWH |
| 25246 | RO | Accumulated charger power low | 0.1KWH |
| 25247 | RO | Accumulated discharger power high | 1000KWH |
| 25248 | RO | Accumulated discharger power low | 0.1KWH |
| 25249 | RO | Accumulated buy power high | 1000KWH |
| 25250 | RO | Accumulated buy power low | 0.1KWH |
| 25251 | RO | Accumulated sell power high | 1000KWH |
| 25252 | RO | Accumulated sell power low | 0.1KWH |
| 25253 | RO | Accumulated load power high | 1000KWH |
| 25254 | RO | Accumulated load power low | 0.1KWH |
| 25255 | RO | Accumulated self_use power high | 1000KWH |
| 25256 | RO | Accumulated self_use power low | 0.1KWH |
| 25257 | RO | Accumulated PV_sell power high | 1000KWH |
| 25258 | RO | Accumulated PV_sell power low | 0.1KWH |
| 25259 | RO | Accumulated grid_charger power high | 1000KWH |
| 25260 | RO | Accumulated  grid_charger power low | 0.1KWH |
| 25261 | RO | Error message 1 |  |
| 25262 | RO | Error message 2 |  |
| 25263 | RO | Error message 3 |  |
| 25264 | RO | reserved |  |
| 25265 | RO | Warning message 1 |  |
| 25266 | RO | Warning message 2 |  |
| 25267 | RO | reserved |  |
| 25268 | RO | reserved |  |
| 25269 | RO | Serial number High |  |
| 25270 | RO | Serial number Low |  |
| 25271 | RO | Hardware version | 1.00.00 |
| 25272 | RO | Software version | 1.00.00 |
| 25273 | RO | Batt power | W |
| 25274 | RO | Batt current | A |
| 25275 | RO | Batt voltage grade | 48:48V                         24:24V 12:12V |
| 25276 |  | reserved |  |
| 25277 | RO | Rated power(W) | W |
| 25278 | RO | Communication Protocal Edition | 1.00.00 |
| 25279 | RO | Arrow Flag | bit |

## Sheet: `Inverter Alarm`

| Address | Type | Name | Unit / Values |
|---------|------|------|---------------|

## Sheet: `PV Charger ModbusRtu (ID == 4)`

| Address | Type | Name | Unit / Values |
|---------|------|------|---------------|
| 10001 | RO | The type of machine |  PC1600 |
| 10002 | WR | Serial number High |  |
| 10003 | WR | Serial number Low |  |
| 10004 | RO | Hardware version | 1.0.00 |
| 10005 | RO | Software version | 1.0.00  |
| 10006 | WR | PV voltage calibration coefficient | 16384 |
| 10007 | WR | Battery voltage calibration coefficient | 16384 |
| 10008 | WR | Charger current calibration coefficient | 16384  |
| 10103 | WR | Float voltage | 0.1V |
| 10104 | WR | Absorption voltage | 0.1V |
| 10105 | WR | Battery low voltage(for PV;PH) | 0.1V |
| 10106 | WR | reserved |  |
| 10107 | WR | Battery High voltage(for PV;PH) | 0.1V |
| 10108 | WR | PV max charger current(for PV;PH) | 0.1A |
| 10110 | WR | Battery type | 0:no choose                                  1:Use defined battery                 2:lithium battery 3:SEALED_LEAD  battery   4:AGM  battery   5:GEL  battery   6:FLOODED  battery   |
| 10111 | WR | Battery AH | 1AH            |
| 10112 | WR | Remove the accumulated data | 0：No remove the accumulated data                                             1：Remove the accumulated data    |
| 10118 | WR | Battery equalization enable | 0:Disable 1:Enable   |
| 10119 | WR | Battery Equalization voltage | 0.1V |
| 10120 | WR | reserved | reserved |
| 10121 | WR | Battery equalized time | 1min |
| 10122 | WR | Battery Equalized timeout | 1min |
| 10123 | WR | Equalization interval | 1day |
| 10124 | WR | Equalization actived immediately | 0:No effect                                                           1:Action  |
| 15201 | RO | Charger workstate | 0：Initialization mode  1：Selftest Mode 2: Work Mode 3：Stop Mode |
| 15202 | RO | Mppt state | 0：Stop 1：MPPT  2: Current limiting |
| 15203 | RO | charging state | 0:Stop 1:Absorb charge  2: Float charge 3:EQ charge |
| 15204 | RO | reserved |  |
| 15205 | RO | PV voltage | 0.1V |
| 15206 | RO | Battery voltage | 0.1V |
| 15207 | RO | Charger current | 0.1A |
| 15208 | RO | Charger power | 1W |
| 15209 | RO | Radiator temperature | 1℃ |
| 15210 | RO | External temperature | 1℃ |
| 15211 | RO | Battery Relay |  |
| 15212 | RO | PV Relay |  |
| 15213 | RO | Error message | Refer to frame Charger Error message 1 |
| 15214 | RO | Warning message | Refer to frame Charger Warning message 1 |
| 15215 | RO | BattVol Grade | 1V |
| 15216 | RO | Rated Current | 0.1A |
| 15217 | RO | Accumulated PV power high | 1000KWH |
| 15218 | RO | Accumulated PV power low | 0.1KWH |
| 15219 | RO | Accumulated day | 1day |
| 15220 | RO | Accumulated hour | 1hour |
| 15221 | RO | Accumulated minute | 1minute |

## Sheet: `PV Charger Alarm`

| Address | Type | Name | Unit / Values |
|---------|------|------|---------------|